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Date: Thu, 2 Dec 2021 08:00:00 -0800
From: Gregory Fong <gregory.0xf0@...il.com>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: devicetree@...r.kernel.org,
Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
Rob Herring <robh+dt@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
"maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE"
<bcm-kernel-feedback-list@...adcom.com>,
Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
Ulf Hansson <ulf.hansson@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Matt Mackall <mpm@...enic.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Ray Jui <rjui@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Markus Mayer <mmayer@...adcom.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Al Cooper <alcooperx@...il.com>,
Doug Berger <opendmb@...il.com>,
"open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)"
<linux-ide@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
"moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
"open list:MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND..."
<linux-mmc@...r.kernel.org>,
"open list:PWM SUBSYSTEM" <linux-pwm@...r.kernel.org>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@...r.kernel.org>,
"open list:REAL TIME CLOCK (RTC) SUBSYSTEM"
<linux-rtc@...r.kernel.org>,
"open list:THERMAL" <linux-pm@...r.kernel.org>,
"open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 05/14] dt-bindings: gpio: Convert Broadcom STB GPIO to YAML
Hi Florian,
I haven't kept up with the new yaml format, so not entirely sure I
know what I'm talking about yet, but here are a few comments:
On Wed, Dec 1, 2021 at 12:51 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
> Convert the Broadcom STB GPIO Device Tree binding to YAML to help with
> validation.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> .../bindings/gpio/brcm,brcmstb-gpio.txt | 83 --------------
> .../bindings/gpio/brcm,brcmstb-gpio.yaml | 104 ++++++++++++++++++
> MAINTAINERS | 2 +-
> 3 files changed, 105 insertions(+), 84 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
> create mode 100644 Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml
>
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
> deleted file mode 100644
> index 5d468ecd1809..000000000000
> --- a/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
> +++ /dev/null
> @@ -1,83 +0,0 @@
> [snip]
> -
> -- interrupts-extended:
> - Alternate form of specifying interrupts and parents that allows for
> - multiple parents. This takes precedence over 'interrupts' and
> - 'interrupt-parent'. Wakeup-capable GPIO controllers often route their
> - wakeup interrupt lines through a different interrupt controller than the
> - primary interrupt line, making this property necessary.
It looks like interrupts-extended was removed from the new docs, I'm
assuming that was intentional?
> [snip]
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml b/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml
> new file mode 100644
> index 000000000000..4b7309dc74dc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml
> @@ -0,0 +1,104 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/brcm,brcmstb-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom STB "UPG GIO" GPIO controller
> +
> +description: >
> + The controller's registers are organized as sets of eight 32-bit
> + registers with each set controlling a bank of up to 32 pins. A single
> + interrupt is shared for all of the banks handled by the controller.
> +
> +maintainers:
> + - Doug Berger <opendmb@...il.com>
> + - Florian Fainelli <f.fainelli@...il.com>
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - brcm,bcm7445-gpio
> + - const: brcm,brcmstb-gpio
> +
> + reg:
> + maxItems: 1
> + description:
Missing folded block scalar marker ('>') above
> + Define the base and range of the I/O address space containing
> + the brcmstb GPIO controller registers
> +
> + "#gpio-cells":
> + const: 2
> + description: >
> + The first cell is the pin number (within the controller's
> + pin space), and the second is used for the following:
> + bit[0]: polarity (0 for active-high, 1 for active-low)
> +
> + gpio-controller: true
> +
> + "brcm,gpio-bank-widths":
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
Same here
> + Number of GPIO lines for each bank. Number of elements must
> + correspond to number of banks suggested by the 'reg' property.
> +
> + interrupts:
> + maxItems: 1
> + description:
While it's not necessary while this is only one line, consider adding
'>' here too.
> + The interrupt shared by all GPIO lines for this controller.
> +
> + "#interrupt-cells":
> + const: 2
> + description: >
This next block could get formatted strangely with '>'; recommend
using '|' instead
> + The first cell is the GPIO number, the second should specify
> + flags. The following subset of flags is supported:
> + - bits[3:0] trigger type and level flags
> + 1 = low-to-high edge triggered
> + 2 = high-to-low edge triggered
> + 4 = active high level-sensitive
> + 8 = active low level-sensitive
> + Valid combinations are 1, 2, 3, 4, 8.
> +
> + interrupt-controller: true
> +
> + wakeup-source:
> + type: boolean
> + description: >
> + GPIOs for this controller can be used as a wakeup source
> +
> +required:
> + - compatible
> + - reg
> + - gpio-controller
> + - "#gpio-cells"
Need to add required property "brcm,gpio-bank-widths"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + upg_gio: gpio@...0a700 {
> + #gpio-cells = <2>;
> + #interrupt-cells = <2>;
> + compatible = "brcm,bcm7445-gpio", "brcm,brcmstb-gpio";
> + gpio-controller;
> + interrupt-controller;
> + reg = <0xf040a700 0x80>;
> + interrupt-parent = <&irq0_intc>;
> + interrupts = <0x6>;
> + brcm,gpio-bank-widths = <32 32 32 24>;
> + };
> +
> + upg_gio_aon: gpio@...172c0 {
> + #gpio-cells = <2>;
> + #interrupt-cells = <2>;
> + compatible = "brcm,bcm7445-gpio", "brcm,brcmstb-gpio";
> + gpio-controller;
> + interrupt-controller;
> + reg = <0xf04172c0 0x40>;
> + interrupt-parent = <&irq0_aon_intc>;
> + interrupts = <0x6>;
> + wakeup-source;
> + brcm,gpio-bank-widths = <18 4>;
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 913856599623..78161abc384f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3772,7 +3772,7 @@ BROADCOM BRCMSTB GPIO DRIVER
> M: Gregory Fong <gregory.0xf0@...il.com>
Not really related to this patch, but I should probably update this
entry to reflect current reality. Should that be you and/or Doug?
> L: bcm-kernel-feedback-list@...adcom.com
> S: Supported
> -F: Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
> +F: Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml
> F: drivers/gpio/gpio-brcmstb.c
>
> BROADCOM BRCMSTB I2C DRIVER
> --
> 2.25.1
>
Best regards,
Gregory
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